Pretty sure they already know that won’t be enough, like with what’s being expended on the war already. Ukraine has virtually no economy until the war ends, and that’d be devastatingly expensive for an entire country even not fighting a war.

But I also want to point out, lumping all the cost on Russia might be another treaty of Versailles style mistake. Any Russian not yet born or old enough to be involved right now, doesn’t bear responsibility and shouldn’t be made to. They don’t need actual legit grievances to want revenge against the west for.